package com.itheima.exception;

import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(
            HttpServletRequest httpServletRequest,
            HttpServletResponse httpServletResponse,
            Object handler, Exception ex) {


        System.out.println("my exception is running ...."+ex);
        ModelAndView modelAndView = new ModelAndView();
        if (ex instanceof NullPointerException){
            modelAndView.addObject("msg","空指针异常");

        }else if(ex instanceof ArithmeticException){
            modelAndView.addObject("msg","算术运算异常");

        }else {
            modelAndView.addObject("msg","未知的异常");
        }
        modelAndView.setViewName("error,jsp");

        return modelAndView;
    }
}
